package org.apache.archiva.web.startup;
   
   /*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *  http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  import org.apache.commons.lang.StringUtils;
  import org.slf4j.LoggerFactory;
  
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  /**
   * Banner 
   *
   *
   */
  public class Banner
  {
      private static final String eol = System.getProperty("line.separator");
  
      public static String encode( String raw )
      {
          // Canonicalize line ends to make them easier to process
          raw = raw.replace("\r\n", "\n").replace("\r", "\n");
  
          StringBuilder encoded = new StringBuilder();
          int rawlen = raw.length();
  
          for ( int i = 0; i < rawlen; i++ )
          {
              char c = raw.charAt( i );
              if ( c == '\\' )
              {
                  encoded.append( "$." );
              }
              else if ( c == '$' )
              {
                  encoded.append( "$$" );
              }
              else if ( c == '\n' )
              {
                  encoded.append( "$n" );
              }
              else if ( Character.isDigit( c ) )
              {
                  encoded.append( c );
              }
              else if ( Character.isLetter( c ) )
              {
                  encoded.append( rot13( c ) );
              }
              else if ( i < raw.length() - 1 )
              {
                  char nc;
                  boolean done = false;
                  int count = 0;
                  for ( int n = i; !done; n++ )
                  {
                      if ( n >= rawlen )
                      {
                          break;
                      }
  
                      nc = raw.charAt( n );
  
                      if ( nc != c )
                      {
                          done = true;
                      }
                      else
                      {
                          count++;
                      }
                  }
                  if ( count < 3 )
                  {
                      encoded.append( c );
                  }
                  else
                  {
                      encoded.append( "$" ).append( String.valueOf( count ) ).append( c );
                      i += count - 1;
                  }
             }
             else
             {
                 encoded.append( c );
             }
         }
 
         return encoded.toString();
     }
 
     public static String decode( String encoded )
     {
         StringBuilder decoded = new StringBuilder();
         int enlen = encoded.length();
         for ( int i = 0; i < enlen; i++ )
         {
             char c = encoded.charAt( i );
             if ( c == '$' )
             {
                 char nc = encoded.charAt( i + 1 );
                 if ( nc == '$' )
                 {
                     decoded.append( '$' );
                     i++;
                 }
                 else if ( nc == '.' )
                 {
                     decoded.append( '\\' );
                     i++;
                 }
                 else if ( nc == 'n' )
                 {
                     decoded.append( eol );
                     i++;
                 }
                 else if ( Character.isDigit( nc ) )
                 {
                     int count = 0;
                     int nn = i + 1;
                     while ( Character.isDigit( nc ) )
                     {
                         count = ( count * 10 );
                         count += ( nc - '0' );
                         nc = encoded.charAt( ++nn );
                     }
                     for ( int d = 0; d < count; d++ )
                     {
                         decoded.append( nc );
                     }
                     i = nn;
                 }
             }
             else if ( Character.isLetter( c ) )
             {
                 decoded.append( rot13( c ) );
             }
             else
             {
                 decoded.append( c );
             }
         }
 
         return decoded.toString();
     }
 
     private static char rot13( char c )
     {
         if ( ( c >= 'a' ) && ( c <= 'z' ) )
         {
             char dc = c += 13;
             if ( dc > 'z' )
             {
                 dc -= 26;
             }
             return dc;
         }
         else if ( ( c >= 'A' ) && ( c <= 'Z' ) )
         {
             char dc = c += 13;
             if ( dc > 'Z' )
             {
                 dc -= 26;
             }
             return dc;
         }
         else
         {
             return c;
         }
     }
 
     public static String injectVersion( String text, String version )
     {
         Pattern pat = Pattern.compile( "#{2,}" );
         Matcher mat = pat.matcher( text );
         StringBuilder ret = new StringBuilder();
         int off = 0;
 
         while ( mat.find( off ) )
         {
             ret.append( text.substring( off, mat.start() ) );
             String repl = mat.group();
             ret.append( StringUtils.center( version, repl.length() ) );
             off = mat.end();
         }
 
         ret.append( text.substring( off ) );
 
         return ret.toString();
     }
 
     public static String getBanner( String version )
     {
         String encodedBanner = "$26 $34_$n$15 /$._$7 /$34 $.$n$14 /`/@),$4 |  Ba" +
                 " orunys bs nyy bs gur nycnpnf   |$n$14 |  (~'  __| gbvyvat njnl ba " +
                 "gur Ncnpur Nepuvin |$n$6 _,--.$3_/  |$4 $.$5  cebwrpg grnz, V jbhyq y" +
                 "vxr gb$3 |$n$4 ,' ,$5 ($3 |$5 $.$5     jrypbzr lbh gb Nepuvin$6 |$" +
                 "n$4 |  ($6 $.  /$6 |  $32#  |$n$5 $.  )$._/  ,_/$7 |$36 |$n$5 / /$3 " +
                 "( |/$9 |     uggc://nepuvin.ncnpur.bet/     |$n$4 ( |$4 ( |$10 |     hf" +
                 "ref@nepuvin.ncnpur.bet$7 |$n$5 $.|$5 $.|$11 $.$34_/$n$n";
 
         return injectVersion( decode( encodedBanner ), version );
     }
 
     public static void display( String version )
     {
         String banner = getBanner( version );
         LoggerFactory.getLogger( Banner.class ).info( "{} {}{}" , StringUtils.repeat( "_", 25 ), eol, banner );
     }
 }